Civil construction, despite being an extremely important sector for the country's economic development,
consumes a very significant amount of natural raw materials, in addition to being responsible for most of
the consumption of cement produced in the world. The production of this material, in turn, causes many
environmental impacts, resulting mainly from the sintering stage of clinker (main constituent of cement),
which causes the emission of thousands of tons of CO2 into the atmosphere. In this sense, several studies
have been carried out in order to point out an alternative material that can be used as a mineral addition to
cement instead of clinker. Much of this research has sought to study the use of additions manufactured from
the use of industrial waste. Given this context, the present work aims to analyze the behavior of a modified
Portland cement of the CPIIZ-32 type, produced with partial replacement of clinker, by a residue from the
pre-separator of the ferrosilicon - metallic silicon manufacturing process. - from an industry located in Breu
Branco/PA. Therefore, at first, the physical and chemical characterization of the residue in natura and
processed form was carried out, through the milling process, from the specific mass, FR-X, DR-X and
activity index tests. pozzolanic with lime and cement. Then, 5 (five) blends of composite cement were
formulated with different contents of ground silicon metal residue to analyze the mechanical behavior at 28
and 90 days of curing. Finally, a comparison was made of the physical-mechanical performance of the
mortars produced with the use of modified cement and commercial cement of the CPIIZ-32 type. The results
showed that the metallic silicon residue, after going through a pre-benefiting process (grinding for a period
of 60 minutes) obtains properties consistent with the requirements stipulated by NBR 12653 (ABNT, 2014)
to be considered as a pozzolanic addition. The use of this by-product for this purpose can generate enormous
environmental benefits, reducing the impacts resulting from the clinker production stages, as well as being
a viable alternative for the reverse logistics of this material, since the generating companies still do not have
any form of reuse for this residue.
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